Attachment for typewriters



De 8, 1925. f v

ATTACHMENT vFIOR TYPEWRI TERS Filed Dec. 3o, 1922 Patented Dec. 8, 1925.

UNIT-Eo STATES- EnwrN M. COOPER, 'OE sAN'ERANoIsoO, CALIFORNIA.

ATTACHMENT Eon TYrEwmTEns.

Application med recenter 3o,'19'22. serial No. 609,980.

This invention relates to an attachment for. typewriters, and particularlyto anattachment by means of which the spacer bar Ofa typewriter may be operated. Y

It is` an robject of the invention to provid an attachment which will relieve. the opera tor of the necessity for using the unnatural downward movement of the handin actuating the spacer bar, and will makey it possible for the operator to actuate the spacerbar by a'simple lateral movementof the thumb.

A further Object of the invention, resides in the provision of a device-which is so con-l structed that it may be easily ,amounted on any of the commercial typewriters,fand that it will be inexpensive to manufacture.

which will become apparent as my description progresses, ,the invention `comprises the combination and arrangement of parts as set forth in, and falling within-the scope of, the appended claims. v Y

- In the 4drawingswhich illustrate one embodiment of my lnvention- Figure 1 isa perspective view of the device showing the same clamped on the front bar of a typewriter, and showing its relation tO the spacer bar; j

Figure 2 is a vertical sectional view; Figure 3 is aside elevation; and

Figure 4 is a view of the blank` `from which the operating lever is formed.

The embodiment of the invention which is chosen for the purpose of illustration in` cludes a clamp 10, which is preferably of inverted U-shape in cross section and vformed of sheet metal. This clamp is adapted to be Vmounted on and embrace the front bar 11 of a typewriter and to be heldin such position by the screws 12' which pass loosely through one of the legs of the clamp and have screw-threadedengagement with the other leg. Upon the tightening of the screws it will be seen that the two legs of the clamp are drawn toward each other, thus tightly engaging the fclamp with' the typewriter front bar.

A lever 13 is pivoted'at 14, preferably on the leg of the clamp which is adapted to bey located'on the inner side of the front bar. This lever in its preferred formv iswformed from a single piece of sheet metal andis of the third class. One arm 15`of the lever, into which the pivot passes, extends upwardly along the inner leg of the clamp'and to a point yconsiderably above the latter.` The other arm 16 Vof the leverpextends inangular relation to the first arm and is prof vided on its outer or free end lwith dependingfearsl between which -a roller 18 -2is located, the roller being mounted on a pin 19, which projects between and is mounted in the ears, and depending slightly below" 1,564,757 PATENT OFFICE; l,

the lower edges of the same. This roller is f Y adaptedto eng-age .thespacer bar of theftypen of, y

-l writer.

L It will b e notedthat the arni'lt is of angular form having a portion'20 extend#v ing inwardly over the spacer-'bar and having the roller-carrying portion extendingalong thespacer bar. The portion 2O of this arm 16 :not only is for the purpose ofbriuging llVithv these and other objects in view,

the spacer Fba-r engaging roller intol the proper,v position,'but.italso accommodates the operating key 21.y

lhe movement of the'y lever in both directions is limited by avinger 22, which. extends from the arm- 15 of the lever and operates in a limiting slot 23. In the form of device illustrated in the drawings, this ytinger projects from the lever tothe yopposite side of the pivot from which the arm 15 'prof jects and it operates in a slot 23 which is formed in the lower edge of the inner leg of the clamp.

The clamp placed on the' front bar of theprtype writer and secured inplace'with the leverk disposed between' the clamp and the spacer bar, and the Varm 1.6,. together with the roller 18 which it carries,; Over-l lying the spacer bar, the roller being-held in engagement'with the upper face ofthe spacerbar byits weight and theweightofV ble depression ot' the spacer bar.

the downward movement oit the lever so thatthe spacer bar is only forced downwardly to a sutlicient distance to produce the desired operation, irrespective ot" the amotuit of force applied to the operating key l2 1, so that the typewriter mechanism is relieved of the undue strain incident to the too forcil Furthermore, the finger limits the movement of the lever in the opposite direction under the inlluence of the spacer bar in its rising movement, so that the roller is maintained inoperative relation to the spacer bar and the lever is not completelyv thrown over out of position. i

It will be seen that the device is formed of relatively i'ew parts and that the main parts preferably are made ot sheet metal which may be produced by a simple stampl ing operation.

While I have illustrated a particular embodiment, it is, as lie'reinbetore stated, selected for the purpose or' illustration, and I do not wish to be limited to the details of construction, as it is obvious that many changes in the details may be-made within the scope of the claims.

What I claim is: Y 1. The combination with the frame and spacer bar of a typewriter, of an attachment vt'or operatingthe spacer bar, comprisingv a clamp removably mounted on' the tramega lever having one arm pivoted on said clamp Y and having the other arm extending from they first-mentioned arm and arranged to Y operate the spacer bar; and an operating key mounted at the junction between said arms.

2. The combination with the frame and spacer bar of a typewriter, of an attachment for operating the spacer bar, comp-risinga clanip removably mounted on the frame; a lever having one arm pivotedon said clamp and having the other arm extending from the first-mentioned arm and arranged over the spacer bar; and means formed in said clamp member for limiting the movements of the lever in both directions.

3. The combination with the frame and spacer bar oit' a typewriter, of an attach- Y ment for operating the spacer bar, compris'- .ing a cla-mp removably mounted on the frame; a lever having one arm pivoted on said clamp and having the other arm extending from lthe first-mentioned arm and arranged over the spacer bar; an operating key mounted at the junction between said arms; and means formed in said clamp member for limiting the movements of the lever in both directions.

ll. An attachment for typewriters, comprising a clamp adapted to removably engage the front bar of a typewriter; a lever pivoted on said clamp and having an arm adapted to engage the spacer bar of the typewriter; and cooperating means on the clamp and lever for limiting the movement of the latter.

5. An attachment for typewriters, comprising a clamp adapted to removably engage the trontbar` of a typewriter; and an angular lever of the third class pivoted on the said clamp, said clampl having an arcuate shaped slot and said lever having a lug working in said slot for limiting the movements of thev lever in both directions.

GVAn attachment for typewriters, com-k prising a clamp adapted to removably engage the front baroil a typewriter; va lever having one arm pivoted on said'clamp, said lever comprising a single piece of flat metal having one arm extending in angular relation to the other; a pair of ears depending from the arm'remote from thepivot; 'and 'a roller mounted on a pin extending between said ears. f j g i 7. An attachment for typewriters comprising a clamp adapted to removablyengage a typewriter frame; an angular'lever pivoted adjacent oneend of one of its arms to said clamp, the'otlier ofV said arms having a portion extending in angular relation to the iirstarm and ay portion extendingl inangular relation to the aforementioned portion; a roller mounted on the freeA end of the last-mentioned portion of the second arm; and an operatingI key mounted'on the firstmentioned portion of the second arm of the lever. v Y A 8. An 'attachment for, typewriters, vcomprising aclamp adapted to removably engage a typewriter frame, and an angular lever pivoted adjacent one end of one of its arms to said clamp, the other Varms compris-Y ing a section formed atan angle tothe first named arm and transversely overlying the spacer bar of the typewriter, and a section formed at an angle to the 'transverselyfoverlying section and horizontally overlying said` spacer bar.

9. An attachment for typewriters, comprising a clamp; a lever pivoted tothe clamp, said lever having an upwardly eX- tending arm, and an arm extending substantially horizontally, said last-mentioned arm having a portion extending in angular relation to the first-mentioned arm, 'and a portion extending inv angular relation to the irst-mentioned portion; means on the end of the second arm for engagingth'e spacer bar of a typewriter; and means for limiting the movements of the lever in both directions.

In testimony whereof, I have signed my name to this specication.

ERWIN M. COOPER. 

